When Seth Marvin was born on 14 February 1773, in Oxford, Blooming Grove, Orange, New York, United States, his father, Seth Marvin, was 27 and his mother, Mary Julia Polly Little, was 23. He married Temperance Bradley on 18 September 1796. They were the parents of at least 4 sons and 7 daughters. He died on 12 November 1823, in Blooming Grove, Orange, New York, United States, at the age of 50, and was buried in Chester, Orange, New York, United States.